Closure for paper receptacles.



E. F. HULBERT.

CLOSURE FORPAPER RECEPTACLES.

APPLICATION FILED DEC. 1, 1913.

1,21 3 6%8. Patented Jan. 23, 1917.

I 2 SHEETS-SHEET 2.

V v f I Z WITNESSES HNVENTQR QVNW in eras arana onnron EDWIN F. HULBERT,OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR T0 NATIONAL PAPER CAN COMPANY,OF NORWALK, CONNECTICUT, A CORPORATION OF DELA- WARE.

CLOSURE FOR PAPER RECEPTACLES.

Application filed December 1, 1913.

To all whom it may concern:

Be it known that I, EDWIN F. HULBERT, a citizen of the United States,residing at South Norwalk, Fairfield county, Connecticut, have inventeda new and useful Improvement in Closures for Paper Receptacles, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification, inwhich- Figures 1, 2, 3 and 5 are vertical sections of a portion of areceptacle illustrating different steps in the formation of the closure;F ig. 4 is a perspective View of one of the caps removed; Fig. 6 is avertical sectional view showing a modification; Fig. 7 is asideelevation, partly in section, illustrating a further feature which Iprefer to employ; and Fig. 8 is a plan view, partly broken away, showingthe form of Fig. 7.

The object of my invention is to provide a strong and tight closure forpaper cans of round, square, rectangular or other form, without the useof wax, cement or other coating, the closure being secured wholly bymechanical means.

Referring to the accompanying drawings, Fig. 1 shows the first step inthe operation of forming the closure. In this figure the numeral 2designates a portion of the body of the paper receptacle, and 3 a diskof paper or other suitable material and having a right angled flange 4.This disk is forced into the end portion of the body of the receptacleto any desired distance, which may vary from that flush with the edge upto a distance twice the depth of the flange 4, or any other desirabledistance, as shown in Fig. 1, with the flange projecting outwardly. Theupper edge portion 5 of the body of the receptacle is then curled orpressed inward and down over the flange 4 and substantially paralleltherewith, as shown in Fig. 2. An

annular depression or bead 6 (Fig. 3) is then rolled or pressed into thetriple-ply wall thus formed. In forming this bead, the disk or cap 3 isexpanded and firmly locked in .the wall of the receptacle, being heldnot only by its interlocking engagement with the groove formed in thesaid body, but also by the engagement therewith of the bead formed inthe folded body portion 5.

I next take a flat blank, such as shown at 7 in- Fig. 4, of paper orother suitable material, and force this into the end of theSpecification of Letters Patent.

Patented Jan. 23, 191i 7.

Serial No. 803,914.

receptacle until its peripheral edge snaps into the annular depression6, as shown in Fig. 5, the disk being preferably dished. As this diskpossesses some resiliency, its natural tendency is to resume itsoriginal flat form. This causes it to exert an outward radial pressureat its peripheral edge which acts to firmly pinch the flange 4 betweenthe locking portions of the body. The parts are, in this manner, sotightly seated that when pressure is applied, either inwardly oroutwardly on the closure,,it remains locked firmly in position.

Fig. 6 shows a modified form of closure particularly adapted as a topclosure, to permit access to and the removal of the contents of thereceptacle. This form is constructed the same as that first described,except that the inner cap or disk 3 is formed with a central opening 8,and the outer cap or disk 7 is formed with a centrally depressed portion9, which fits within and closes the said central opening.

As shown in the preferred form of Figs. 7 and 8, 1 form a seat for theinner cap or disk 3 by means of a series of indentations or crimps 10which are pressed into the body of the vessel at spaced apart pointsaround the circumference. By forming these as separate indentations,instead of a circular groove, I avoid weakening the receptacle againstend'wise pressure while obtaining the seat for the disk. The unbentportions of the receptacle wall between the indentations 10- serve likestruts to prevent the bead formed by the indentations from collapsing'under pressure or flattening under tension all softened by liquid.

The advantages of my invention will be apparent from the foregoing,since it provides a closure for paper receptacles which is strong andtight without the use of wax, cement or other coating to secure it inplace and seal the joints.

This can will withstand considerable shocks and blows which may begivenit during shaping or otherwise, on account of the strength of the bracejoint closure.

Various changes may be made in the can, the caps, etc., withoutdeparting from my in vention, the essential feature of which lies infolding the edge of the package body over the flange of the cap and theexpanding of the parts with the locking action of the sec- .ondary cap,which firmly holds the flange and primary cap in place and gives astrong structure, braced against shocks or blows.

What I claim is:

1. The combination with a paper can or receptacle, of an outwardlyflanged cap or disk within the end portion thereof, the flange of saidcap or disk being held between the body of the receptacle and a portionthereof which is turned inwardly within said flange, said parts havinga, locking groove formed therein and an auxiliary cap or disk seatedwithin said groove and exerting an outward locking pressure thereon;substantially as described.

2. A paper can or receptacle having its end portion turned inwardly, acap or disk having an outwardly turned flange held between the body ofthe receptacle and the inwardly turned portion thereof said parts havinga locking groove formed therein .and

'a secondary cap or disk seatedwithin the said inturned portion andexerting an outward locking pressure on the parts; substantially asdescribed.

3. A paper can or receptacle having an inturned end portion, an innercap or closure member having an outwardly turned flange fitted betweensaid inwardly turned portion and the wall of the body of the receptacle,and said 'parts having a locking bead or groove formed therein to lockthe parts together, together with an auxiliary cap or closure whoseperipheral edge is engaged with said groove and arranged to hold saidparts in locked position; substantially as described.

4. A paper can or receptacle having an inturned end portion, an innercap or closure member having an outwardly turned flange fitted betweensaid inwardly turned portion and the wall of the body of the receptacle,and said parts having a locking bead or groove formed therein, togetherwith an auxiliary cap or closure whose peripheral edge is engagedwithsaid groove, the inner cap or closure having a central opening, andthe outer cap or closure having an inset portion fitting within andclosing said opening; substantially as described.

5. A paper can or receptacle having an inturned portion, a cap orclosure member having an outwardly turned flange fitted between saidinturned portion and the wall of the body of the receptacle, said partsbeing beaded to lock them to each other and provided with an annulargroove in the inturned end portion, and an auxiliary bowed cap orclosure sprung into said groove and arranged to hold the parts inposition, substantially as described.

6. The combination with apaper can or receptacle of an outwardly flangedcap or disk within the end portion thereof, said end portion beingturned inwardly over the disk flange, these three parts, namely the endwall of the receptacle, the flange of the disk and the inturned portionof the receptacle having a locking bead, and an auxiliary cap or diskoutside the flanged cap and held by said bead.

7 The combination with a paper can or receptacle of an outwardly flangedcap or disk within the end portion thereof, said end portion beingturned inwardly over the disk flange, these three parts, namely the endwall of the receptacle, the flange of the disk and the inturned portionof the receptacle having an outwardly formed locking bead having agroove on the interior thereof, and an auxiliary cap or disk outside theflanged cap and held by said groove.

8. The combination with a paper can or receptacle of an outwardlyflanged cap or disk within the end portion thereof, said end portionbeing turned inwardly over the disk flange, and an auxiliary spring capor disk outside the flanged cap engaging the turned portion the edgethereof being spaced from the main disk.

9. A can or receptacle having a paper body provided with a series ofindentations forming a seat or bead, said indentations being formed bybent-in portions of the paper body wall and being spaced apart andseparated by strut-like unbent portions of the paper body wall, and acap or closure inserted in the end of the receptacle body and seatedagainst such seat or 'bead, substantially as described.

In testimony whereof, I have hereunto set my hand.

EDWIN F. HULBERT.

Witnesses:

CHARLES F. GEHRMANN, ALFRED N. J OERG.

